8048504: G1: Investigate replacing the coarse and fine grained data structures in the remembered sets
6949259: G1: Merge sparse and fine remembered set hash tables
Co-authored-by: Ivan Walulya <iwalulya@openjdk.org>
Co-authored-by: Thomas Schatzl <tschatzl@openjdk.org>
Reviewed-by: sjohanss, iwalulya
